Defines not being caught

[Thierry]

Let's say I have the following CPP file which include some header file:


/** test.cpp **/
#include "hello.h"


/** hello.h **/
#ifdef HELLO_THERE
#include "someotherfile.h"
#endif

Assuming I'm building the test.cpp file only with the compiler flag
-DHELLO_THERE, how come in "hello.h", it's not even aware of
HELLO_THERE.  That is, it skips the #ifdef HELLO_THERE.

Any help please?

Thanks Thierry